holland-letz



J- 'H OLLAND-LETZ GRINDING MACHINE Original Filed May'n; 1924 '5 sha ts-sheet 1" L/WZMYOZZWEZZZ .1".- HGLLYAND-LETZ GRINDING MACHINE e e ts-Sheet 2 Original Filed Mas 17,"

m nf/oZZazzz? v g/ s I Aug. 23, 1927. I Re. 3

J. HOLLAND-LETZ GRINDING MACHINE OriginalFiled May 17, .924 5 Sheets-Sheet s ,Z/OZZanZZ Z- j r Y {111113 HOLLAND-LETZ lRe RINDING nucnm original Filed May 1' 7, 19 5 sheet 51 at 4 Aug. 23,1927 Re. 16,713

J. HOLLAND-LETZ GRINDING MACHINE Qriginil Filed May 17, 1924 5 Sheets-Sheet 5 Reissuecl Aug. 23, 1927;

UNITED 1 STATES Re. 16,713 PATENT OFFICE.

JOHN" HOLIAHD-LITZ, OI CROWN POINT, INDILNAQASSIGNOB TO THE LETZ Inm- I'LCTURING COMPANY, 01' CROWN POINT, INDIANA, A CORPORATION OI INDIANA.

GRINDING macnmza' Original No. 1,608,769, dated October 12, 1926, Serial No. 713,597, filed Kay 17, 1924. Application 101 e rpm flledl'nne 4, 1927. Serial No. 196,618.

My invention is'concerned with grinding machines, and is designed to produce a simple structure of the classdescribed that shall be especially efiicient and which can be employed to grind jerked'corn, i. e., ears of corn which have been snappedofi of the stalks withoutremoving the usks.v I

H To these ends, it embodies various combinations and features of construction that will be fully described in the specification and particularly enumerated in the claims.

To illustrate my invention, I annex hereto five sheets of drawings, in which ther are ,some reference characters used to designate identical parts in allthe figures, of which 2- Fig. l is a top plan view of a machine'embodying my invention;

Fig. 2 is a. central, vertical section ontheline 2-2 of Fig. 1; r

Fig. is a detail in section on the line 33 of Fig. 2;. 1 Fig. 4 is a 5 is a vertical section on the line 5' 5 of Fig. 1, but on a' larger scale.

Fig. 6 is a detailshowing a portion of the feed adjusting mechanism, on an enlarged scale- 7 Fi spfi' and 8 are details in section on the detail in section on the line H I linesF-T and S8 respectivel ,-of Fig. 6;

' Fig.9 Sheet 1) is a partia end elevation on anenlarged scale, showing the adjusting mechanisms of Figs. 6m 8 assembled;

i the line 10 Fig. 10 is an enlarged detail in section on 10 of F1g.2;" Fig.11, is anenlarged detail of theportion of the mechanism seen in 10, but

- in a different adjustment i Fig. 12 is a detail in section on the line 12-12 of Fig. 10. i

Fig. 13 is a. similar view in section on the line 13- 13 of Fig. 11;

Fig. 14 is a. top plan view of the-concave,- with-the grinding shaft and portions above the same removed; and

Figs. 15 and section on the lines 15 spectively, of Fig. 14.

15 and,16-16, re-

In carrymgout my invention, I refer-i; seen 1n plan ably employ the base casting I viewin Fig. ,14, which is supplorted by the four legs 21 at the corners t ereof :the customary manner and peferably braced by 4 the strips 22, as seen in 2. Bolted to 16 are enlarged details inf the base casting 20, at one end is the bearing casting 23 which has the bearing sleeve 24 for the main'shaft 25, the other end of which 15 journalled in bearings 26 and 27 which may be of any desired construction, and are supported from the outer buhr-casing casting 28, which is bolted to the inner buhrcasing casting 29, which in turn is bolted to the base ca-sting 20, all in the manner well known in the art. The shaft is rotated by power applied to the belt wheel 30, and is preferably, provided with the fly whee'l31.

The shaft 25 has pinned on one end there-f of a toothed sleeve 32, which has theinterior thereof coredout, with the ends bored out to fit snugly on the shaft'25, and the end sleeve 32 ma be of any desired construction,

but are re erably formed of-aplurality of partial elixes with shearing edges and shaped so as to carry the material toward the buhr casingto deliver it to the grinding buhrs.

Theteeth on the sleeve 32 co-operate with the teeth 36 of the concave, and which is best illustrated in Figs. 5 and 14, where it" will be seen that the teeth are formed on two chilled steel castings 37 and 38, which are secured on the concave supporting casting 39 by the bolts 40 having their heads countersunk 'in the chilled castings 37 s and 38. As the teeth'on the sleeve 32 shear with the teeth 36, is is necessary to give them a proper initial adjustmenuas well as to take up wear, and for this purpose I provide the a justments best seen in Figs. 5 and 14 to 16. Onone edge, the casting 39 is provided with the pair of lugs 40, each of which has the elongated, vertically extending slot 41, and upon either side of the center ofthe slot and above it are formed the bearing lugs 42, which co-operate with the bearing surfaces 43 formed onthe under side of the base casting 20. Above the surface 43, the

aperture in the base casting 20 and provided with a lock nut 51-, so that by proper adjustment of the screws 50, the position of the chilled plates 38-and 37 will bemaintained against the thrust resulting from the clock- .wise rotation of the shaft 25, as seen in'Fig.'

5. The casting 39 is supported inits vertic'al'positio n by the bolt 52 having the elongated threaded portion passing through the elongated vertical slot 53 provided in the base casting 20 and locked in position on the casting by ,a lock nut 54. The lower-end of the'bolt passes through the elongated vertical slot 55 formed in the braced extension 56 of the casting 39, the position'of the casting 39 and consequently of the teeth of the concave, beingcontrolled by the nut 57 and the lock nut 58 in a manner which will be readily apparent.

In other words the slots 41 and 55 in the 1 casting 39 permit a horizontal adjustment of. the casting 39 and the adjustment of the nut 57311 the bolt 52 permits a vertical ad'- justment of the casting 39 in a manner I which permits substantially radial adjustment of the teeth 36 of the concave with respect to the axis of the toothed sleeve 32..

ThlS combination adjustment provides a very efiicientfmeans for accomplishing the proper cooperative relation between the teeth of both the concave and'the sleeve.

The base casting 20 has bolted thereon in any desired manner the hopper 59., which is preferably of sheet-metal construction, and has extending through one end thereof a bearing sleeve6O forming a part of the casting 23, and journalled in 'this'sleeve 60 is the short shaft 61, which has; secured thereon the gear wheel 62, which is driven by the spur gearfpinion 63 (see Fig. 3) formed integral with the spur gear wheel 64 journalled onthe stud shaft 65, and which in turn meshes'with the spur gear pinion the spur gear pinion 66 secured on the shaft 25.

A suitable framework 67 is provided to fur:

nish supports forthe'shafts 61 and 65, and to shield the gears62, 64 and 66. The inner, end of the shaft 61 has pinned thereon the sleeve 68,'which has its otherend, best seen in Fig. 4, mounted to rotate on the bearing j stud 69 projecting from the casting 70,

I whichis bolted to the upper portion of the buhr-casing casting 29 by the bolt 71, said bolt thus serving to secure the adjacent side of the hopper 59 between the casting 70 and the casting29, and also to guide the upper feed-controlling plate 72, which has the customary semicircular recess in its lower end,- as seen in Fig. 5, together with the vertical-slot 73, seen in Fig. 2, through which slot thebolt 71 passes, as will be readily apparent.

The sleeve 68 is rotated by the shaft 25 at a reduced speed, say one'to five, and it carties the pair ofigitator teeth 74 and 75, which are preferably cast integral therewith, and areof the general shape of portions of a screw-conveyor helix covering say ninety degrees, but the two'teeth have their ,curvature in the opposite direction, so that each tends to force any material passing it toward the center of the hopper 59, the pur- 3 of the teeth on the sleeve 32, which their tips approach, so thatthe tips of all the teeth lhave about the same peripheral velocity.

The upper-feed-controlling plate 72 is adjusted by the mechanism above described, but for the lower feed-plate 76, I preferably employ the adjusting means best shown in IFigs. 6, 7,8 and 9, where it will be seen" I fulcrum to one of the legs 21 at 77 a lever 37 8 which is connected by the pin and slight- 1y elongated slot connection 79 with the center of the lower portion of the feedregulating plate .76. vThe'other end of'the lever 78 has pivo-tedth'ereto at 80 the spring catch lever 81, which has the nose 82 adapted to cooperate with the toothed segment 83 secured to the opposite leg 21. Located in the recess 84 in the lever is the helicallycoiled expanding spring 85 which holds the dog 82 in any position of adjustment on the segment 83. With the mechanism shown, it will be observed that the plate 7 6 can quickly be adjusted to a nicety, and Will remain in its adjustment until a change, is desired.

Referring now to Figs. 10 to 13, the buhrcaslng casting 29 is provided on its inner periphery with an annular flange 86, which has one'face 87 thereof beveled. as seen in Figs. 12 and 13, and it is also provided with a plurality of projections 88 extending out beyond the flange 86 and toward the center.

The traln- IIS 3 acme meling buhr 90 is preferabl a separate annular plate bolted to the buhr-supporting ring91, which rin is provided'on its inner periphery with t e flange 92, having its surfaces parallel with the surfaces 87 and 89 of the flange 86 and the lugs 88. At a number of laces corresponding in their location to t e location of. the'lugs 88 are s 93 cut in the flange 92. The outer periphery of the plate 91 is provided with the diametrically oppositely located lugs 94, which co-operatewith lugs 95 projecting inwardly from the surface of the buhr-casing casting 29.

The operation of the mechanism just described is as follows:

when the trammeling buhr is to be put in place, it is turned so that the notches 93 are 1n tion 2 plate' 91 can be shoved into ace, thus locating the trammeling buhr 90. It is then turned anti-clockwise, asseen in Fig. 10, until the lugs 94 engage the lugs 95, and thrust ofthe auger serves to hold these In S in position and the plate 91 in place, whi e the connections shown permit the necessary trammeling of the buhr 90 as it cooperates with the rotating buhr 96 secured to the plate 35..

As will be seen from the dotted-line outline of the trammeling buhr 90, shown in 10, it is provided on its inner periphery wit a plurality of teeth 99 which have edgesand project inward into shearing engagement with the adjacent periphery of the auger 33, thus furnishing additional means for disintegrating the material before it reaches the grinding surfaces of the buhr Referring to the action of the tooth 7 5 and. the co-operating' elements, itwill be apparent that the .teeth on the sleeve 32 feed the corn" as it is being broken. up toward the outlet from the concave and hopper, through which outlet the screw 33 extends,-and as the rate of feed is usually faster than the corn can pass through the outlet, it tends to pile up adjacent the outlet, and this is especially I w e s ciently broken true of the corn which may not-have been sufliciently broken up. The corn so piled up is engaged by the. tooth and forced back to the center over that beneath it, which is being fed in the oppositedirection by the teeth on the sleeve 32, so that a cirunit, as it were, is established for the corn: outward adjacent the sleeve 32 to the outlet, then upward for some of the corn, and inially for any that is not sulfipip then back to the center,

own again and is subjected as it once-more moves outward to the outlet. It will also be noted that both of the teeth 74 and 7 5 have .the

where it drops angle of their. quires very small and the. p

are quite. long axially, and are wide 'ster with the lugs 88, in which posh enough radially so that they reach nearly to the teeth on the sleeve. 32, so that the teeth 74 and 75 have some action in cooperation with said teeth on the sleeve 32 in breakingup the ears of corn. Furthermore, the above-described shape of the teeth 74 and 75 is. such that the corn husks cannot very well wind about the sleeve 68, and to lessen this possibility, it will be noted that the ends of the teeth 74 and 7 5 overlap.

While I have shown anddescribed my invention as embodied in the form which Iat' present consider best adapted to carry out its purposes, it will be understood to be capable of modifications, and that I do not desire to be limited in the interpretation of the following claims except as may be necessitated by the state of the prior art.

What I claim as new, and desire to secure by'Letters Patent of the United States is:

I. In a machine of the class described. the combination with a hopper, of a toothed concave secured at the bottom thereof, a shaft journalled concentricallywith the concave, teeth on the shaft co-operating with the teeth on the concave, a discharge outlet from one end of the concave toward which the material is fed by the teeth on the shaft,-

a second shaft journalled in the hopper above the toothed shaft, and a projection on said second shaft designed to feed the material, passing some of it back toward 7 the: center of the hopper. I

2. In a machine of the class described,- the combination with a hopper, of a toothed concave secured at the bottom thereof, a shaft journa-lled cncentrically with the con- Ice cave, teeth on the'shaft co-operating with the teethon the concave, a dischargeoutlet from oneend of the concave toward which the material is fed by the teeth on the shaft, a. second shaft journalled in the hopper abo e the toothed shaft, and projections on sai second shaft designed to feed the material, passing some 0 'it back toward the center of the hopper, said projections on said. second shaft consisting of a plurality of. helical members projecting from the shaft the helixes at each end being so dithat they tend to force the material toward the center. g

3. In a machine of the class described, the combination with a hopper, of a toothed concave secured at the bottom thereof, a shaft journalled concentrically with the concave, teeth on the shaft co-operat-ing with the teeth on the concave,.a discharge outlet from one' endofthe concave toward which the material is fed by the teeth on the shaft, a second shaft journalled in the hopper above the toothed" shaft, projections on said second shaft designed to feed the material, passing some of it back toward thecenter of the hoper, and speed-reducing gearing from the first shaft to the said second shaft,

4. In a machine of the classdescrib'ed the; combination with a hopper, of-a toothed con-, cave securedto the bottom thereof, a shaft,

journalled concentrically withthe concave,

teeth on the shaft co-operating with the-teeth on't-he concave, a discharge outlet from one end of the concave toward which the mate,- rial is fed by the teeth, a bearing in one endv of the hopper, a short shaft extending through the bearing, a gear wheel. secured on the.

outer end of the shaft, an opposed stud shaft supported from the other end of the hopper,

a sleeve journalled on the stud shaft atone end and having its other end pinned tot-he shaft journalled concentrically with the concave, teeth on the shaft co-operating with the teeth on the concave, a discharge outlet from one end of the concave, towardhwhi'ch the material is fed by the teeth onthe shaft, a second shaft ournalled in the hopper above the toothed shaft, and a helical tooth of a small curvature extendingfrom the outlet end of said second shafttoward the center: and serving to feed material about the outlet back toward the center of the'hopper.

6. In a machine of the class'described, the combination with a casing having an outlet aperture therein, of' a shaft mounted to ro tate therein and having shearing teeth therelon, said teeth being designed to carry the material toward the outlet aperture,"a eon;

cave member forming the bottom of the cask ing and hav ng plural rows of shearing teeth,-

and means to adjust said concave both verticall and horizontally relative to the casing to etermine the clearance between the two sets of teeth, said means consisting of aplurality of elongated slots at one edge of the concave with a bearing lug above each slot and another slot on the opposite side, vertical screw bolts passing through said slots and apertures above them in the casing, and horizontally adjustable stop bolts set in the casing on the side opposite to the bearing ltws. 1

I. In a machine of the class described,the combination with a casing having an outlet aperture therein, of a shaft mounted to ro-i tate therein and having shearing teeth thereon, said teeth being designed to carry the material toward the outlet aperture, a concave member forming the bottom of the -casing and having plural rows of shearing. teeth, I

and means toadjust said concave both'vertically and horizontally relative to the casing to determine the clearance between the two sets of teeth, said meansconsisting of a pluralityofelongated slots at one edge of the; concave with abearinglug above-each slot and another. slot on the opposite edge, vertical screw bolts passing through said slots and apertures above them in the casing, and, horizontally adjustable stop bolts set in the casing .on the sidev opposite to'the bearing lugs, the heads of the. bolts at the bearing lugs being seated in correspondingly shaped recesses formed in the casing, I a

8. In a machine of the class described, the combination with a casing having anflou tlet aperturetherein, :ofashaft mounted to rotate therein and having shearing teeth there on, said teethbeing designed to carry. the material toward the outlet aperture, a concave member forming the bottom of the casing and having plural rows of shearing-v teeth, and meansto adjust said concavefboth verti cally and horizontally relative to the casing to determine, the clearance between the two sets of teeth, said means consisting 'of a p111 rality of elongated'slots at one edge of the concave with a bearinglug above each slot and another slot on the opposite edge, vertical screw bolts passing through said slots and apertures above them in the casing, and horizontally adjustable stopboltsset inf-the casing on the side opposite to the'bearing lugs, the horizontal bolts being threaded through nuts set in correspondingly shaped, recesses in the casing; j o v v 9. Ina machine of theclass described, the combination with a hopper, of toothed confcave secured at 'the bottom thereof, a shaft journalled concentrically with "the i concave, teeth onthe shaft co-operating with the teeth on the concave, a discharge outlet from one end of the concave toward which the material isfed by the teeth on theshaft. a. second shaft journalled in the'hopp'er' above the toothed shaft, and a pair of" oppositely-di rected helical teeth of'small curvature ex'-' tending from the ends of 'the second shaft to a point well past the center, and serving to feed material toward the center ofthe hopp Q 10."In"-'a }grinding machine, the combination with the concave casing, of a buhr'cas ing into which the concave casing-'opens,a-v shaft extending through said casings and journalled to rotate thereiman auger secured on the shaft and extending through the v openingbetween the two casings, rotating buhr on the shaft, and a-trammelin'g buhrc o-operating therewith and having cutting teeth extending substantially to th eadjac'ent peripheral surfaces of'the auger, said cu-t ting teeth and adjacent peripheral surfaces beingin'a common verticalp'lanei 5 11. In a'grindi-ngmachine, asha 'ftlhavin'g' a toothed sleeve with its ;ends-fitting"snuglyon the shaft; one of its ends beingfpinned thereto, an auger on said shaft "having-itsend adj acent to the toothed sleeveinterlockedabutting the other end of the auger and pinned to the shaft. 7 7

12. In a'grinding machine the combination with a casing having concave, of a buhr casing into which said concave opens, a shaft journaled to rotate therein and having teeth to co-operate with the concave, and an auger to carry material from the concave to the buhr casing, a sliding plate to regulate the I size of the aperture from the concave to the buhr casing, and means for adjusting and securing the plate. I

13. In a grinding machine, the combination with a casing having a concave, of a buhr casing into which said concave opens, a shaft journalled to rotate therein and having teeth to cooperate with the concave and an auger to carry material from the concave to the buhr casing, a sliding plate to regulate.

the size of the aperture from the concave to the buhr casing, and means for adjusting and securing the plate, consisting of a lever and pivotally connected to the slide and having a spring catch lever co-operating with a notched segment.

14. In a machine of the class described, the combination with a hopper, of comminuting means located, in the lower portion thereof, an agitator shaft journalled in the hopper above the comminuting means, and projections on the agitator shaft designed to feed the material passing it toward the center of the hopper, said projections consisting of elongated circular teeth of a small curvature and of radial dimensions approximating the diameter of jerked Indian corn.

15. In a machine of the class described, the combination with a casing having an outlet aperture therein a 'shaftmounted to rotate therein and having shearing teeth-thereon, said teeth being designed to carry material toward said outlet aperture, aconcave forming the bottom of the casing, a plurality of teeth carried by said concave and means whereby said last-named teeth may be adjusted horizontally and vertically relative to said shaft for determining the clearance between the two sets of teeth.

16. In a machine of the class described, the combination with a casing havin an outlet aperture therein, a shaft mounte to rotate thereon, said teeth being therein and having shearing teeth thereon, said teeth being designed to carry material toward said outlet aperture, a concave forming the bottom of the casing, a plurality of teeth carried by said concave and means connected with said concave whereby said teeth may be vertically and horizontally adjusted with respect to the axis of said shaft for determining the clearance between the two sets of teeth.

17. In a machine of the class described, the combination with a casing having an outlet aperture therein, a shaft mounted to rotate therein and having shearing teeth thereon,

said teeth being designed to carry material toward said outlet aperture, a concave forming the bottom of the casing, a plurality of teeth carried by said concave and means whereby said last-named teeth-may be adjusted substantially in a radial direction with respect to the axis of said shaft for determining the clearance between the two sets of teeth.

18. In a machine of the class described, the combination with a casing having an outlet aperture therein, of a shaft mounted to rotate therein and havin shearing teeth thereon, said teeth being esigned to carry the material toward the outlet aperture, a concave member forming the bottom of the casing and having plural rows of shearing teeth, and means to adjust said concave horizontally and vertically relative to said casing to determine the clearance between the two sets of teeth.

19. In a machine of the class described, the combination with a casing having an outlet aperture therein, of a shaft mounted to rotate therein and havin shearing teeth esigned to carry the material toward the outlet aperture, -a concave member forming the bottom of the casing and having plural rows of shearing teeth, and means to adjust said concave with respect to said casing whereby'the teeth carried by said concave may be adjusted substantially radially with respect to the axis of said shaft.

In witness whereof, I have hereunto set my hand this 27th day of May, 1927.

JOHN HOLLAND-LETZ. 

